| LI Zhao-hui,LI Mei-yan,HAN Bin,LI Ge,WANG Zhi-zhong,SUN Shen-zhen.High-pressure Plunger High-speed Laser Cladding Nickel-based Alloy Coating Structure and Wear Resistance[J],49(10):45-54 |
| High-pressure Plunger High-speed Laser Cladding Nickel-based Alloy Coating Structure and Wear Resistance |
| Received:August 19, 2020 Revised:October 20, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.10.005 |
| KeyWord:laser cladding high speed laser cladding nickel base alloy the dilution rate microstructure wear resistance |
| Author | Institution |
| LI Zhao-hui |
School of Materials Science and Engineering, China University of Petroleu East China, Qingdao , China |
| LI Mei-yan |
School of Materials Science and Engineering, China University of Petroleu East China, Qingdao , China |
| HAN Bin |
School of Materials Science and Engineering, China University of Petroleu East China, Qingdao , China |
| LI Ge |
School of Materials Science and Engineering, China University of Petroleu East China, Qingdao , China |
| WANG Zhi-zhong |
School of Materials Science and Engineering, China University of Petroleu East China, Qingdao , China |
| SUN Shen-zhen |
School of Materials Science and Engineering, China University of Petroleu East China, Qingdao , China |
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| Abstract: |
| Although laser cladding coating has high binding strength, fine grain and high hardness, its low cladding efficiency, high crack sensitivity and high powder consumption seriously limit its wide application in industry. To solve this problem, researchers put forward high speed laser cladding and ultra-fast laser cladding method, through high-speed improve nickel-based alloy laser cladding coating and improve wear resistance coating. Methods the wear resistant coating of SD-NI45 on High-pressure plunger is prepared using Conventional Laser Cladding (CLA) (P=1.8 kW, vs=500 mm/min) and High-speed Laser Cladding (HLA) (P=1.8 kW, vs =7000 mm/min). The dilution rate, microstructure and hardness of the two coatings were measured, and the wear resistance of the cladding layer was analyzed by micro-friction and wear tester with controlled atmosphere and scanning electron microscope. The dilution rate of high speed laser cladding layer is about 68% of that of conventional laser cladding layer. The phase of high-speed laser cladding layer is basically the same as that of conventional laser cladding layer, and there is no new phase precipitation, mainly including γ-(Ni,Fe) solid solution, Cr-Ni-Fe solid solution, Cr23C6 and a small amount of WC and other strengthened phases. However, the overall structure of high-speed laser cladding layer is finer and the distribution of hard particles is more uniform. The microhardness of high-speed laser cladding layer and conventional laser cladding layer are 600HV0.1 and 460HV0.1 respectively. The wear width of the high-speed laser cladding layer and the conventional laser cladding layer are 210 μm and 315 μm respectively, and the wear loss is (7.4±0.8) mg and (4.4±0.6) mg respectively. The wear resistance of the high-speed laser cladding layer is about 1.7 times higher than that of the conventional laser cladding layer. The high-speed laser cladding technology can effectively improve the crack sensitivity, high dilution rate and thick coating of conventional laser cladding layer, and the hardness and wear resistance of high-speed laser cladding layer are improved compared with conventional laser cladding layer. |
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